89 Julia

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89 Julia
Synodic rotation period
11.388336±0.000001 h (0.4745 day)[4]
0.216 (calculated)[3]
0.1764±0.007[2]
0.176 [6]
S
8.74 to 12.61[7]
6.60
0.18" to 0.052"

Julia (

main-belt asteroid that was discovered by French astronomer Édouard Stephan on August 6, 1866. This was first of his two asteroid discoveries; the other was 91 Aegina. 89 Julia is believed to be named after Saint Julia of Corsica. A stellar occultation
by Julia was observed on December 20, 1985.

The spectrum of 89 Julia shows the signature of

sidereal rotation period of 11.38±0.01 with an amplitude of 0.20±0.02 in magnitude.[9]

Nonza crater and Julian family

89 Julia is the parent body of the eponymous

Julia family of asteroids. Observations of 89 Julia by the VLT's SPHERE instrument identified a 'highly probable' crater 70–80 km in diameter and 4.1±1.7 km deep in the southern hemisphere as the only visible possible source of the family.[10] The crater was named Nonza by the discoverers, referring to the commune on the island of Corsica where Saint Julia was born.[11]
The excavated volume is on the order of 5,000 to 15000 km3. It is hypothesized an impact 30 to 120 million years ago by another body approximately 8 kilometers in diameter may have created the collisional family.

References

  1. ^ Noah Webster (1884) A Practical Dictionary of the English Language
  2. ^
    NASA Jet Propulsion Laboratory
    , retrieved 13 May 2016.
  3. ^ a b c d e P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
  4. ^ a b c d e Vernazza et al. (August 2018) The impact crater at the origin of the Julia family detected with VLT/SPHERE?, Astronomy and Astrophysics 618, DOI: 10.1051/0004-6361/201833477
  5. ^
    doi:10.1016/j.pss.2012.03.009
    . See Table 1.
  6. ^ Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
  7. ^ "AstDys (89) Julia Ephemerides". Department of Mathematics, University of Pisa, Italy. Retrieved 27 June 2010.
  8. doi:10.1016/j.newast.2003.12.005
    .
  9. ISSN 1052-8091
    .
  10. ^ Vernazza, P.; Broz, M.; Drouard, A. "Astronomy & Astrophysics (A&A)". www.aanda.org. Retrieved 20 December 2019.
  11. ^ Vernazza, P. "ESO/VLT/SPHERE Survey of D>100km Asteroids : First Results" (PDF). USRA. Retrieved 20 December 2019.

External links

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